By setting the IncludeAll to true, I can get lots of record types after invoking the CustomRecordTypeReadAll web service, but there is no Category, Group and User object.
Anyone know why? Thanks in advance!
I've run into this and similar items before. While I've never asked for an official answer, it appears that items you cannot change in the CRM On Demand admin interface are not included in queries like CustomRecordTypeReadAll. For example, I don't think you can rename the User object in CRM On Demand, so the value is not returned in CustomRecordTypeReadAll.